Apply union expansion when checking ops involving typevars #19455
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sterliakov
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… have other places that create same-id copies of typevars
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
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Fixes #19454.
Fixes #18203.
Fixes #12899 (one error remains, but it is correct).
This might not be the most disciplined approach, but it should match the general expectations. In essence, here I apply union expansion to upper bounds the same way it was applied to plain unions.